Composite PV Module Frames: Innovation Enabled by Pultrusion Technology

In recent years, the photovoltaic industry has seen growing demand for lightweight, corrosion‑resistant frames that also offer electrical insulation. Composite frames based on glass‑fiber‑reinforced polyurethane (GF‑PU) are emerging as a significant alternative to traditional aluminum frames, thanks to their unique material properties and the pultrusion manufacturing process.

Material and Process Features

These frames are produced continuously via the pultrusion process, using glass fibers as reinforcement and polyurethane resin as the matrix. During production, the fibers are impregnated with resin and then cured in a heated die to form a profile with a specific cross‑sectional shape. This process enables high‑efficiency, high‑precision mass production, which aligns perfectly with the large‑scale manufacturing requirements of PV module frames.

Key Product Advantages

• Lightweight: The composite material has a lower density than aluminum alloys, resulting in a significantly lighter finished frame, which reduces transport costs and simplifies installation.

• Excellent Corrosion Resistance: The material withstands salt spray, ammonia, acidic/alkaline chemicals, and damp‑heat environments, making it suitable for harsh settings such as coastal, agricultural, industrial, and desert areas.

• Electrically Insulating – No Grounding Needed: As a non‑metallic material, the frame has high electrical resistivity, eliminating the need for grounding hardware and helping to mitigate potential‑induced degradation (PID), thereby enhancing long‑term system reliability.

• Good Thermal Expansion Matching: Its coefficient of thermal expansion closely matches that of glass, reducing thermo‑mechanical stress on the module laminate during temperature fluctuations and extending module lifetime.

• Flame Retardancy and Weather Resistance: The material has a good flame‑retardant rating and maintains stable mechanical properties after UV and damp‑heat aging tests, ensuring safe long‑term outdoor use.

• Environmentally Friendly and Recyclable: Being non‑metallic, the frame can be classified as recyclable and processed using established mechanical or chemical recycling methods, contributing to a lower carbon footprint.

Application Scenarios

The frames are available in various configurations (e.g., glass‑glass, glass‑backsheet, lightweight modules) to accommodate different PV module designs. Their outstanding corrosion resistance and lightweight nature make them particularly suitable for installations in coastal areas with severe salt‑spray corrosion, humid regions with heavy rainfall, and desert zones with wide temperature variations.

Our Services

as a specialized manufacturer of pultrusion equipment and technology, GOOGIO is committed to providing comprehensive production solutions for industries such as PV frame and window profile manufacturing. For the mass production of composite frames, we offer:

• Complete Pultrusion Production Lines: Including creels, impregnation systems, heated dies, pulling units, automatic cutting, and other core components.

• Customized Process Support: Optimizing pultrusion speed, temperature profiles, and other parameters based on the customer’s resin system (e.g., polyurethane, epoxy) and profile geometry to ensure consistent product quality.

• Automation Integration: Incorporating on‑line inspection and control systems to improve yield and production efficiency.

Companies interested in composite frame production are welcome to contact us for more information on our equipment and technical solutions.